Refrigerating apparatus



May 7,1935. H. GEORGE 9 5 REFRIGERATING APPARATUS Filed April 30, 1929 5Sheets-Sheet l May 7,1935. I H. GEORGE. a I 2,000,590

REFRI GERATI NG APPARATUS Filed April 30. 1929 3 sheet-sh'eet 2 4,3 I Al c I 82 a Jr 2 4 4a fl c 4 I 70 c a c 80. c 83 83&

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,uNiTso STATES PATENT OFFICE REFRIGERATING APPARATUS Herbert George,Dayton, Ohio, assignor, by mesne assignments, to General MotorsCorporation, a corporation of Delaware Application April 30, 1929,Serial No. 359,400

2 Claims. (Cl. 220-9) This invention relates to refrigerating aptionwhich is placed around the food compartparatus and more particularly tothe manufacment or brine tank. Ordinarily, rotting is ture of a domesticor retail ice cream refrigeracaused by the condensation of atmospherictor cabinet adapted to be used with a mechanical moisture in theinsulation because of the low refrigerating system. temperature of thelining and of the insulation 5 An object of this invention is to providea surrounding it. This rotting is obviated by the refrigerator cabinetwhich is not liable to rot use of substances which do not havehydroscopic because of condensation within its parts. tendencies andwhich are highly rot resisting. Another object is to provide a method ofman- These substances may be applied to the cabinet ufacture ofrefrigerator cabinets which is efliby the method herein disclosed veryexpeditious- 10 cie'nt and provides a cabinet which is not liable ly andin a manner adapted to large quantity to rot because of condensationwithin its parts. production such as is necessary for modern in- Furtherobjects and advantages of the present dustry. invention will be apparentfrom the following A cabinet embodying features of this inven- 1description, reference being had to the accomtion may include aframework. -The framework panying drawings, wherein a preferred form ofmay comprise front vertical corner pieces 55 the present invention isclearly shown. and rear vertical corner pieces 80. These cor- I thdrawings: ner pieces may be joined at the top by hori- Fig. 1 is avertical cross-sectional view of a zontal pieces 51 extending along thesides of the cabinet embodying features of this invention; cabinet andpieces 51a. and 51b extending along 20 Fig. 2 is a verticalcross-sectional view, taken the front and rear respectively. The bottomsat right. angles to Fig. 1; of the vertical frame members may be joinedFig. 3 is an enlarged view of the upper left by side horizontal members83, a rear horizontal hand corner of Fig. 2; member 83a and a fronthorizontal member 83b.

Fig. 4 is a horizontal cross-sectional view If desired, intermediatehorizontal members may 25 taken through the upper compartment of Fig. 1;also join the vertical frame members. Thus Fig. 5 is a horizontalcross-sectional view side horizontal frame members 82 may be placedtaken through the lower compartment of Fig. 1; intermediate the ends ofthe vertical frame Fig. 6 is an enlarged view of the upper left members.Also a rear intermediate frame 'memhand corner of Fig. 4; her 82a may beused and a front intermediate 30 Fig. 7 is a view similar to Fig. 3 of amodified horizontal frame member 16a may also join the form; andvertical frame members. Thus it is seen that Fig. 8 is an enlarged view,somewhat diagramthe members 55, 16a and 57a form a door jamb matic, of arock wool fibre with asphaltic sizing which is adapted to support asheet metal food thereon, compartment generally designated as 23. The 35This invention relates to the manufacture of compartment 23 may bebox-like in character various types of refrigerator cabinets such as andits edge may be nailed to the door jamb, are ordinarily used fordomestic purposes or for preferably by providing a bend 46 and an offsetthe storage of ice cream and which are ordiedge 41 to be nailed to thedoor jamb. After narily cooled bymechanical refrigerating systhe foodcompartment has been secured in the 40 tems. A cabinet of the type whichmay be framework the cabinet thus far. manufactured manufacturedaccording to this invention is dismay be placed consecutively with itsvarious closed in the application of Henry P. Braeutigam sides, top andbottom uppermost u the and William CrHolbrook, Serial No. 257,989, ck ofhe a t m y be pl uppe 45 filed February 29, 1928 now Patent No.1,832,089 and a layer 200 of bituminous cement may be 45 dated November17, 1931. A cabinet embodying applied to the outer surface of the backof the features of this invention may also be manucompartment 23.Preferably the cement is apfactured with the aid of an apparatus such aspl ed by m n of the apparatus disclosed in the disclosed in theapplication of Cecil A. Mann said application of Cecil A. Mann. Whilethe for Refrigerating apparatus filed concurrently bituminous cement isstill at the proper tem- 50 herewith now Patent No. 1,902,654 datedMarch perature, a layer 20H of specially prepared rock 21, 1933.Reference is made, if necessary, to wool is placed on the bituminouscement. If these applications for further disclosure. desired a layer202 of bituminous cement may It is desirable in manufacturing cabinetsof also be placed on the outside of the layer of .55 this type toprevent the rotting of the iisula-' rock wool. As indicated, this lastlayer may extend beyond the edge of the insulating layer and form ahermetic joint with the frame members surrounding the insulation as'shown at 202, although a. hermetic joint may be obtained withoutnotching the frame pieces, as shown in Fig. 7. The layers thus appliedto the cabinet may be cooled or caused to be cooled and the cabinet maythen be placed in a position to apply the insulation to another side (ortop or bottom) of the compartment 23 by placing said side in itsuppermost position. By this method of manufacture the bituminous cementmay be readily applied since it flows naturally to an even layer becauseof the horizontal surface and does not tend to run while hardening.

In order to provide an insulating layer of material which is not liableto rot, the insulating material is made of rock wool and is preferablyprepared in compact slabs with proper sizing with asphaltic material.Preferably a suitable rock such as an, argillaceous limestone is meltedand is thenblown into fibers, for instance, by steam. The fibers 2l0thus produced are individually covered with asphaltic material 2| l, asshown in Fig. 8, and are compressed into suitable blocks or slabs to beapplied to the cabinet. The sizing may be applied by emulsifying theasphaltic material in water and applying it to the individual rockfibres, for instance by soaking a mass of fibres in the emulsifiedasphalt, after which the moisture may be evaporated, for instance in anoven. The fibres may be compressed either before or after the moistureis evaporated, it being essential only that the fibres may be compressedto the slablike form so that it may be readily handled and applied tothe cabinet in the same manner as if it were a board. The sizing ofasphaltic material permits the rock fibres at the surface of the slab toadhere properly with the bituminous cement. This sizing permits theouter layer of fibres to adhere quicklyand also permits the bituminouscement to be applied at a sufiiciently 'low temperature to prevent thebituminous cement from penetrating very deeply into the body of the slaband at the same time forming a strong bond with the surface. Thetemperature of the bituminous cement when applied to the rock wool ispreferably regulated so that penetration into the rock wool is reducedto a minimum while providing a strong bond between the parts. When thesurfaces of the food compartment adjacent the door jamb are covered withthe bituminous cement, the bend 41 provides a thick layer 206 of cementwhich forms a tight joint at this point.

After all of the outer surfaces of the food compartment lining 23 havebeen covered in the manner heretofore described, the outer casing of therefrigerator cabinet may be applied to the structure. Any suitablemetallic outer casing may be used. As an example the type of outercasing disclosed in the said application of Henry P. Braeutigam andWilliam C. Holbrook may be used. This may include side panels 30 and 3|,a rear panel 45, front panels 40, 4|, 42, 43 and top 93 to cover thestructure.

Other details shown in the drawings may be used in the cabinet, ifdesired, and are more fully described in the said application Serial No.257,989.

Preferably in the process of manufacture, the cabinet may be placed on atrack as disclosed in the application of Cecil A. Mann and it may beplaced in its various positions either on the track or it may be removedperiodically from the track while various operations are being performedupon it, such as while the layers of cement and insulation are beingapplied.

While the form of embodiment of the invention as herein disclosed,constitutes a preferred form, it is to be understood that other formsmight be adopted, all coming within the scope of the claims whichfollow.

What is claimed is as follows:

1. A refrigerator cabinet including a framework, a box-like sheet metalfood compartment supported by said framework, the framework includingframe pieces extending along and beyond the corners of the foodcompartment to form rectangular recesses on the outer surface of saidcompartment, a layer of bituminous cement on the outer surface of saidfood compartment in said recesses, a layer of compressed baked rock woolin each of said recesses with its fibres individually sized withasphaltic material, means for hermetically sealing said layers, and anouter metallic casing supported by said framework.

2. A refrigerator cabinet including a framework, a box-like sheet metalfood compartment supported by said framework, the framework 7 of saidrecesses outside said layer of rock wool and extending in a continuoussheet between and being hermetically sealed to the framework. and anouter metallic casing supported by said framework.

HERBERT GEORGE.

